USBRH/TEMPERATURE/GPP

MINI DATA LOGGERUSER’S MANUAL

HT08Please read this manual carefully and thoroughly before using this product.

HT08 - Manual-RR-FINAL_061914_awb

TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 4

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 – 5

Safety Instruction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

What’s in the Blister Pack. . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Product Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 – 12

Installing/Replacing the Battery . . . . . . . . . . . . . . . . . 7

Install Software and Drivers . . . . . . . . . . . . . . . . . 7 – 9

Configure the Unit . . . . . . . . . . . . . . . . . . . . . . . 9 – 12

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . . . 13 – 16

Deploy the Unit . . . . . . . . . . . . . . . . . . . . . . . . 13 – 14

Stop Logging and Import Logs . . . . . . . . . . . . . . . . . 14

Viewing, Printing and Exporting Data Logs . . . . 14 – 16

Other Indications . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance Tips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Return for Repair Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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INTRODUCTIONThank you for purchasing General Tools & Instruments’ HT08 USB RH/Temperature/GPP Mini Data Logger. Please readthis user’s manual carefully and thoroughly before using theinstrument.The HT08 is a low-cost, compact, battery-powered thermo-hygrometer capable of unattended logging (recording) of theambient temperature and relative humidity (RH) of anenvironment for days, weeks or months. In addition, softwareincluded with the product can also calculate and displayabsolute humidity levels in units of grains per pound (GPP) org/kg. Also called mixing ratio, GPP is a more useful moisturemetric than RH to water damage remediators. Using RHalone, a remediator might unknowingly introduce moist air—with a low RH but a high GPP—during a job’s drying phase. Data logging can be started or stopped by pushing a buttonon the unit, eliminating the need to bring a laptop to the jobsite. After a data log has been captured and stored, it can beuploaded as a .txt file to any PC running the Windows®7 orWindows® XP operating system after plugging the HT08 intoone of the computer’s USB ports. The HT08’s internal flashmemory is large enough to store 16,300 pairs of RH andtemperature readings.Included with the product—which is slightly larger than athumb drive—is a mini-disc with the drivers needed tointerface the unit to the computer, as well as software thatcan display a data log file as a table or graph and/or export itto Microsoft Excel. Exporting to Excel is recommended forsophisticated trending and analysis of humidity andtemperature data and easy detection of unexpectedexcursions.

3Windows® 7 and Windows® XP are registered trademarks of Microsoft Corporation.

Applications for the HT0808

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include:

• Water damage remediation—Because the HT isdesigned to be deployed and left in place over theduration of the job, it is always in equilibrium with theenvironment.

• Process control—The HT enables, simplifies and cutsthe cost of environmental monitoring of office buildings,greenhouses, food and equipment storage facilities,wineries, freezers, shipping containers, HVAC/Rinstallations, computer rooms, labs, libraries, museumsand saunas.

• Electronics manufacturing—Alerts provided by the low-humidity alarm function of the HT can mitigate the riskof damaging high-voltage static discharges.

KEY FEATURES• One button starts/stops data logging without a PC

• Plug-and-play USB 2.0 interface; no need for cables,cradles or docks

• Large storage capacity: 16,300 pairs of RH andtemperature readings

• Two LEDs indicate device working status and “memory full”

• Included software is used to set: Sampling time from 10 seconds to 12 hours; Hi/Lo alarm setpoints forhumidity and temperature; Temperature unit (°F or °C)

• Software also calculates and plots GPP and dew point andwet bulb temperatures and displays data logs as time-based graphs synchronized to your PC’s clock

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• One-click exporting of logs to Excel

• Long battery life (up to one year)

• Includes USB extension cable

• One-year warranty

SAFETY INSTRUCTIONDo not use the HT08 in the presence of flammable orexplosive gases.

WHAT’S IN THE BLISTER PACKThe HT08 comes in a blister pack that also contains

• One “1/2 AA” battery. Replacement batteries (Part No. BA10) are available from General(www.generaltools.com).

• A disc with software drivers for Windows7 and WindowsXP computers, the ELusb V1.21.2 program for capturingdata logs and displaying them as curves, and a PDF ofthis user’s manual

• A USB extension cable

• A hard copy of this user’s manual (inside the fold-overcard)

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PRODUCT OVERVIEWFig. 1 shows the main components, controls, display andconnectors of the HT08. Familiarize yourself with their namesand functions before moving on to the Setup Instructions.

A. Temperature and humidity sensor window

B. Battery compartment (latch is on rear of unit)

C. Two-color (green and red) LEDs (indicate device loggingand configuration status and “memory full”)

D. USB plug

E. Protective cap

F. MODE button

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SETUP INSTRUCTIONSINSTALLING/REPLACING THE BATTERY

The HT08 uses a 3.6VDC “1/2 AA” Lithium-ion battery. To open the battery compartment, use a paper clip or ascrewdriver with a fine point to push in the silver flangeshowing through the small square hole in the rear of the unit(left photo above). Push back the cover (middle photo),remove the old battery (right photo) and insert a fresh batteryin the correct orientation. Then replace the cover, pushing itforward until you feel and hear a click.

Whenever you change the battery, each of the two LEDs willflash red once, and then green once.

Note: If the battery is removed from a unit before it has beenset up from software or while it is recording, the unit must bereconfigured before it can be reactivated. If it is notreconfigured, the unit will remain in standby mode.

INSTALL SOFTWARE AND DRIVERS1. Place mini-disc in tray of CD/DVD drive, shiny side down.

Close tray.

2. When the AutoPlay window appears, click on “Open folderto view files using Windows Explorer.”

3. Windows Explorer will indicate that there are two “FilesCurrently on the Disc”. One is actually a folder containing a PDF of the HT08

08 user’s manual (as well as PDFs of the

manuals for the HT20 and HT50_larger versions of the HT

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with LCDs). Copy the HT08 manual to your computer’s harddrive for permanent storage. The other file is a WindowsInstaller Package (.msi file) named “ELusb V1.21.2.msi”.Double-click its icon.

4. A window titled “Welcome to ELUsb Installation Wizard” will appear. Click Next to continue.

5. Within the Software License Agreement window thatappears next, click the I agree (T) box.

6. The next three windows advise that the ELusb applicationwill be installed in your computer’s C:\Program Files foldersin a new subfolder named , and that shortcuts tothe program will be created on your desktop and QuickLaunch bar. If you want to install the software elsewhere,click Browse and choose another location. Within eachwindow, after selecting either the default location oranother location, click Next(N) to continue.

7. When the “Preparing to Install” window detailing thechanges to made appears, click Install (I) to continue.

8. Before the installation begins, a User Account Controlwindow may appear and ask, “Do you want to allow[ELusb V1.21.2.msi] to make changes to this computer?”Click Yes to continue.

9. The ELUsb Setup Wizard will now install the program onyour computer. On the next window that appears, click theCompleted (F) box.

10. At the bottom of the Device Driver Installation Wizard thatappears next, click Next to continue.

11. The next window to appear is a Windows Securitywindow. Click on “Install this driver software anyway” tocontinue.

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12. The next Device Driver Installation Wizard window willadvise you that an HT08

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/20/50 driver from General Toolsor Kecheng Laboratories was successfully installed andthat your device is now “Ready to use.” Click Finish tocontinue.

CONFIGURE THE UNITNote that the software installation has added a icon toyour desktop. To facilitate access to the program, right-clickon the icon and pin it to both your Start button and the QuickStart area at the left of your taskbar. You can now eject theinstallation mini-disc and store it with your other importantsoftware.

Plug the HT into an available USB port of your computer. Ifyour computer is a laptop and the only available USB jackdoes not have enough vertical clearance to accommodatethe HT08

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without mechanically stressing its USB plug, donot plug the HT directly into the jack. You do not wantthe plug of the HT to support any of the weight of thelaptop. If that is the case, plug the HT into the jack of theincluded USB extension cable and insert the plug of theextension cable into the computer’s USB jack.

The first time you plug the HT into your computer, yoursystem tray will notify you that the computer is “InstallingDevice Driver Software”. When the notification disappears,open the ELusb program by selecting it via your Start button,clicking on its icon on your taskbar, or double-clicking itsdesktop icon.

If the software has installed correctly and you have pluggedthe HT into a working USB port of your computer, thefollowing screen should appear on your computer’s display.

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Note: If you have already used your HT08 to log dataand it is still in recording mode, plugging the unit inwill cause the following window to appear.

Click Yes to stop recording and import all data recorded tothat point in time. Click No to continue to Setup withoutimporting recorded data (meaning it will be lost). ClickCancel to go back and unplug the unit from the USB port.

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Fig. 2. The three options made available by plugging the HT08 into a USB port

Device HT08 is connected!

You can now use the software to “configure” your HT08.Configuring the device means choosing four key parameters:

• Sampling time—How often it makes and storeshumidity and temperature measurements.

• Temperature unit—degrees Fahrenheit or Celsius (°F or °C).

• High and low temperature alarm setpoints• High and low humidity alarm setpoints

To begin, click on “Set up the USB Data Logger” in thewindow shown in the figure above. Doing so will cause thefollowing window to appear.

Using your mouse, trackball or touchpad, first choose yourTemp Scale and Sample Rate (sampling time). With regard tosampling time, using the shortest setting of 10 seconds may

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Device HT08 is connected!

Fig. 3. The HT08 configuration (Setup) window

result in too much essentially identical data being stored inmemory, potentially limiting its capacity to capture importantevents such as an unexpected excursion of temperature orhumidity. Conversely, using the longest sampling time settingof 12 hours will likely cause important events to goundetected.

If you are an experienced data logger, you already know howto choose the optimum sampling time for your application. Ifyou are a novice, pick a sampling time closer to the minimumsampling time than the maximum, on the assumption that theHT08

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probably has enough memory (16,300 pairs of RH andtemperature readings) to store all the data you ask the meterto log—unless you use it to log data for months, rather thanweeks or days.

Be aware that if you do manage to fill up the HT ’s memory(by logging for a very long time at a very short sampling time,for example), the device will simply stop recording. It will notcontinue recording by overwriting the oldest saved data withnew data.

If you wish, you can also drag the sliders shown in the figureto set high and low alarm setpoints for temperature andhumidity.

Once you have chosen your data logging parameters, clickSetup. A window will appear advising that “The device is setup successfully.” Clicking Setup also synchronizes the HT ’sinternal clock with your computer’s clock, giving all data logsto be captured an absolute time reference.

You can now unplug the HT08 from your computer’s USB port.The unit is in “standby” mode, ready to begin logging data.

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OPERATING INSTRUCTIONSDEPLOY THE UNITThe HT08

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is particularly easy to deploy on a job site becausethe unit does not need to be plugged into a computer to beactivated (ready to start logging data). Working together, theMODE button and the pair of two-color LEDs (Fig. 1, CalloutsF and C) serve as the control and indicators needed to: 1)start and stop data logging and 2) verify and change the unit’sworking status.

That leaves only two things to be sure of when choosing aplace to deploy the HT :

• The temperature and humidity sensor window (Fig. 1, Callout A) is not covered

• The humidity and temperature values at the unit’slocation are “representative” of the room

The HT —with its protective cap on—can be deployedeither by laying it on a horizontal surface or by hanging itvertically within the included plastic mounting bracket. Theback of the bracket features both a magnet and a hangerhole.

Once you have deployed the HT , you can initiate datalogging. To start data logging, press and hold the MODEbutton for at least 3 seconds. Both LEDs will flash greentwice to confirm that logging has begun.

STOP LOGGING AND IMPORT LOGSTo stop data logging, press and hold the MODE button for atleast 3 seconds. Both LEDs will flash red 2 or 3 times toconfirm that logging has stopped.

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That is how you should stop data logging if you plan to initiateanother logging session later without uploading logged datato your computer in the interim. If you allow logging tocontinue and you do not upload your data to your computersoon, you risk filling up the HT08

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’s memory.

A simpler and safer way to stop data logging is to plug theHT into your computer’s USB port immediately aftercompleting a logging session and then use the ELUSBsoftware to stop logging.

Each time you plug the HT into the USB port, the windowshown in Fig. 2 will appear. When you plug in the unit, itmakes no difference whether it is still logging; the procedurefor uploading (importing) data logs is identical. Just click onthe middle selection—Stop the USB Data Logger anddownload data—to instantly execute both functions. Thedata will be imported as a .txt file. A “Save As” window willappear, asking you to identify where you want the file to bestored and what you want to name it.

VIEWING, PRINTING AND EXPORTING DATA LOGSImmediately after you close the “Save As” window by clicking on Save, the uploaded data log will automatically bedisplayed as a set of curves representing all loggable values.Fig. 4 is a typical example. The initial display includes allparameters, including dew point and GPP or g/kg (which thesoftware automatically calculates) and alarm setpoints that youmay have entered during Setup. To remove any parameter orhorizontal and vertical grid lines from the overall plot, uncheckits box at right.

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Fig. 4. A typical initial plot of an imported data log

There are several features shown in Fig. 4 worth noting:

• To mark the position of every recorded data point on thecurve, check the “Mark Points” box at the top of the sidebarat right.

• To get a higher-resolution view of the data recorded duringa specific period of time, scale up and down the curves bydragging the slider at the bottom of the window to the leftand right.

• Hovering the cursor over a particular point of the curvedisplays all data related to this point—including themaximum, minimum and average values of the entirecurve—in a shaded box at upper left.

• The dates and times shown on the x-axis scale and in theupper left corner are in sync with your computer’s clock.

• To print the .txt file of any data log, click the Print virtualbutton.

• To open a previously saved data log, click the Openbutton. This function is also available as the “Viewpreviously saved data” option shown in Fig. 2.

• To export a file to Excel for advanced trending andanalysis, click the Export to Excel button.

OTHER INDICATIONSAs mentioned earlier, the MODE button and the pair of two-color LEDs work together to indicate the current workingstatus of the HT08. For example, the MODE button can beused to confirm whether or not the unit has been configured(activated) using the software’s Setup window (see Fig. 3):

• If the unit is ready to log data, a quick press of theMODE button will cause both LEDs to flash green once.

• If the HT08 needs to be configured, the two LEDs willalternately flash red and green twice.

If a quick press of the MODE button causes both LEDs toflash red once, logging has been stopped because thememory is full.

During data logging, the pair of two-color LEDs will flashgreen or red to indicate whether measured humidity andtemperature values are within or outside the band betweenthe preset low and high alarms:

• The LEDs will alternately flash green one time each ifthe values of both parameters have not exceeded theirsetpoints.

• The LEDs will alternately flash red one time each if thevalue of either parameters has exceeded its setpoints.

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SPECIFICATIONS

Temperature Measurement Range -4° to 158°F (-20° to 70°C)

Temperature Measurement Accuracy ±1.8°F (1°C) from 14° to104°F (-10° to 40°C); ±3.6°F (2°C) elsewhere in range

Temperature Measurement ±0.2°F (0.1°C)Resolution and Repeatability

Relative Humidity (RH) 0 to 100%Measurement Range

RH Measurement Accuracy ±3% from 20 to 80%RH,±3.5% elsewhere

RH Measurement Resolution ±0.1%and Repeatability

Internal Storage Capacity 16,300 pairs of RH/Tempreadings

Temperature Response Time 5-30 seconds

Humidity Response Time 8 seconds

Interface USB 1.0/2.0

Length of USB Extension Cable 7.9 in. (200mm)

Dimensions 3.74 x 1.11 x 1.22 in. (95 × 28× 31mm)

Weight ~1.41 oz. (40g) without battery

Power Source 3.6V non-rechargeable (1/2 AA) 1200mAh Lithium-ion battery

Current Consumption

MAINTENANCE TIPS• Avoid dropping the unit. Do not subject it to violent shock

or vibration or expose it to strong electromagnetic fields(for example, near arc welders or induction heaters).

• Keep the unit out of direct sunlight.

• Do not use chemicals or abrasive cloth to clean thedisplay window or housing.

• Before storing the HT08 for an extended period of time(several months or more), remove the battery to avoidhaving it leak and damage the unit.

WARRANTY INFORMATIONGeneral Tools & Instruments’ (General’s) HT08 USBRH/Temperature/GPP Mini Data Logger is warranted to the originalpurchaser to be free from defects in material and workmanship fora period of one year. Subject to certain restrictions, General willrepair or replace this instrument if, after examination, the companydetermines it to be defective in material or workmanship.This warranty does not apply to damages that General determinesto be from an attempted repair by non-authorized personnel ormisuse, alterations, normal wear and tear, or accidental damage—including dropping the unit. The defective unit must be returned toGeneral Tools & Instruments or to a General-authorized servicecenter, freight prepaid and insured.Acceptance of the exclusive repair and replacement remediesdescribed herein is a condition of the contract for purchase of this product. In no event shall General be liable for any incidental,special, consequential or punitive damages, or for any cost,attorneys’ fees, expenses, or losses alleged to be a consequence of damage due to failure of, or defect in any product including, but not limited to, any claims for loss of profits.

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RETURN FOR REPAIR POLICYEvery effort has been made to provide you with a reliable product of superior quality. However, in the event your instrument requiresrepair, please contact our Customer Service to obtain an RGA(Return Goods Authorization) number before forwarding the unit viaprepaid freight to the attention of our Service Center at this address:

General Tools & Instruments80 White Street

New York, NY 10013212-431-6100

Remember to include a copy of your proof of purchase, your returnaddress, and your phone number and/or e-mail address.

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GENERAL TOOLS & INSTRUMENTS80 White Street

New York, NY 10013-3567PHONE (212) 431-6100

FAX (212) 431-6499TOLL FREE (800) 697-8665

e-mail: sales@generaltools.comwww.generaltools.com

HT08 User’s Manual

Specifications subject to change without notice

©2014 GENERAL TOOLS & INSTRUMENTSNOTICE - WE ARE NOT RESPONSIBLE FOR TYPOGRAPHICAL ERRORS.

MAN# HT08 06/12/14